To sadden or displease (someone) by underperforming, or by not delivering something promised or hoped for.
His lack of respect disappointed her.
To deprive (someone of something expected or hoped for).
To fail to meet (an expectation); to fail to fulfil (a hope).
To show (an opinion, belief, etc.) to be mistaken.
To prevent (something planned or attempted).
Causing disappointment.
disappointing results / news; a disappointing experience